Glass manufacturing – Processes – Forming product or preform from molten glass
Patent
1989-06-28
1990-12-18
Lacey, David L.
Glass manufacturing
Processes
Forming product or preform from molten glass
65 182, 65900, 65 321, C03B 37012
Patent
active
049783785
ABSTRACT:
A glass preform for use in the fabrication of an optical fiber having little bubbles is produced by a method comprising depositing glass soot on a periphery of a starting glass rod to form a porous glass preform, heating and sintering the porous glass preform in a helium atmosphere to consolidate the porous glass preform and then heating the sintered glass in an atmosphere containing an inert gas except helium having partial pressure of the inert gas of not lower than 0.8 atm. to obtain a transparent glass preform.
REFERENCES:
patent: 3806570 (1974-04-01), Flamenbaum et al.
patent: 4149867 (1979-04-01), Akamatsu et al.
patent: 4157906 (1979-06-01), Bailey
patent: 4251251 (1981-02-01), Blankenship
patent: 4586943 (1986-05-01), Kyoto et al.
Ikemura et al., "Manufacture of Quartz Glass Performs", Chemical Abstracts, vol. 107, No. 4, Abstract 27346q.
Akira Iino, "Production of Base Material for Optical Fiber", Patent Abstracts of Japan, vol. 11, No. 267, (C-443[2714], Aug. 28, 1987.
Danzuka Toshio
Ito Masumi
Takagi Masahiro
Yokota Hiroshi
Burns Todd J.
Lacey David L.
Sumitomo Electric Industries Ltd.
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